Operating panel of a floor cleaning machine



FIG. 1 is a front, top and right side perspective view showing the design;

FIG. 2 is a front, top and left side perspective view showing the design;

FIG. 3 is a front elevational view of the design; and,

FIG. 4 is a top plan view of the design.

The broken line showing of various elements in the drawings is for the purpose of illustrating mechanical components and forms no part of the claimed design. 

The ornamental design for an operating panel of a floor cleaning machine, as shown and described. 